Emergency vehicle wheel



Patented May 21, 1940 UNITED STATES PATENT OFFICE 2,201,488 raocnss 0Fmomma METALS No Drawing. Application October 5, 1938, Serial No. 233,477

16 Claims.

The present invention relates to the cleaning of metallic surfaces andparticularly to a new class of steel pickling inhibitors which areemployed to prevent undue attack upon the surface of a metal when incontact with a pickling bath of an acid nature.

Pickling solutions for removing oxides from the surface of metalsordinarily consist largely of a dilute solution of an inorganic acidsuch as sulfuric or hydrochloric acid. The acid although it dissolvesthe oxides and scale, also attacks the metal to some extent so that theacid is largely consumed and a certain amount of metal is lost. It alsoappears that the hydrogen liberated by the action of the acid on themetal has a serious embrittling effect upon the metal being treated. Theescaping hydrogen also carries with it a fine spray of the acid liquorfrom the pickling bath which produces an atmosphere possessing corrosiveproperties and one which is injurious to health and damaging toequipment.

By the present invention, these objectionable features of the picklingprocess are substantially overcome or reduced to a minimum. Morespecifically, some of the objects of the present invention are toobviate over-pickling, embrittlement and pitting of the articlestreated; to minimize the amount of metal lost in pickling; to increasethe efiiciency of the pickling operation; to prolong the effective lifeof the pickling bath; and particularly to facilitate the picklingoperation. Other and further objects of the invention will be apparentfrom the following description and accompanying examples.

To accomplish to as great an extent as possible the objects set forth inaccordance with the present invention, there is added to the picklingbath an inhibitor or regulating agent which acts to restrain the .actionof the acid from attacking clean metal but assists in removing the rust,scale, and other deposits or in other words the inhibitor causes theacid selectively to remove such materials without appreciably attackingthe clean portions of the metal under treatment.

The new class of pickle regulators comprise the esters of thiocarbamicacids and are commonly referred to as thiourethanes. Except for theN-alkyl compounds which are liquids, they are usually solid crystallinecompounds of relatively low melting point. One method for their.preparation is by the action of ammonia or an amine on a xanthic esteralthough other methods have been described in the chemical literatureand may be employed when desired. One precaution to be observed,whatever the method of preparation, is that the thiourethanes, whilerelatively stable compounds in other respects, readily undergo oxidationin the presence of mild oxidizing agents and should not be heated in thepresence of oxidizing mineral acids nor in the presence of excesscaustic soda which catalyzes their decomposition. well known class ofcompounds and the present invention in nowise relates to theirpreparation nor is it limited thereto.

In order to further illustrate the class of compounds to which thepresent invention pertains, the thiourethanes are designated by thefollowing structural formula wherein R1 and R2 represent hydrogen,alkyl, aralkyl and carbocyclic groups, the latter term including typicalaryl groups and hydrogenated aryl groups and R3 represents an esterforming radical such as alkyl, aralkyl and carbocyclic groups, thelatter term likewise including typical aryl and hydrogenated arylgroups.

Typical examples of the preferred class of compounds are H l N-butylthiourethane "(HHPR --c--o-c,n.

N-dibutyl thiourethane (C4119) FN C 0''C3H| H N-p-diphenyl thiourethaneN-E-O-Czfl.

The thiourethanes are a May 21, 1940. E. H. HILL 2,201,489

EMERGENCY VEHICLE WHEEL Filed Sept. 21,- 1939 2 Sheets-Sheet 2 INVENTOREdward H. Hill BY aw, ,mvm

- ATTORNEYS Patented May 21, 1940 UNITED STATES fPATENT OFFICE 8 Claims.

My invention relates to emergency wheels for vehicles and moreparticularly to a wheel that is capable of being easily and quicklyattached to the regular vehicle wheel in the event of a tire 5 punctureso that the vehicle may proceed to its destination or a place of tirerepair.

Generally speaking, my device takes the form of an auxiliary wheelhaving a rim segment that may be moved out of its wheel completingrelation to the remainder of the wheel to facilitate attachment to thevehicle wheel when the tire is flat, the segment being thereafterautomatically returned to wheel completing position when the vehicle ismoved. A structure of this type therefore combines the features of ajack in that it removes the vehicle load from the disabled tire and alsoof an ordinary wheel since the vehicle may be driven on the emergencywheel.

Devices have heretofore been proposed for accomplishing this generalresult, but they have usually been provided with segments which swingout of the plane of the wheel. Structures of this nature, however, areincapable of being used with the modern motor car, because the emergencywheel is of necessity attached to the regular vehicle wheel and offsetoutwardly therefrom. Accordingly, if the emergency wheel were providedwith a swinging segment, it would interfere with the aprons which hangfrom the fenders for improving the appearance of the vehicle andconcealing parts of the chassis.

It is therefore the principal object of my invention to devise anemergency wheel having a movable segment that operates in the plane ofthe 35 wheel and hence will not have its movement obstructed by anyparts of the vehicle.

A further object is to provide a wheel of the character indicated havinga ring-member for closely fitting the inner surface of a vehicle wheelrim and providing a continuous bearing that serves to transmit the loadof the vehicle to the emergency wheel.

These and further objects of my invention will be set forth in thefollowing specification, refer- 45 ence being had to the accompanyingdrawings,

and the novel means by which said objects are efiectuated will bedefinitely pointed out in the claims.

In the drawings: r Fig. 1 is an elevation of my improved emergenc wheelin the collapsed condition which it assumes when being applied to avehicle wheel:

Fig. 2 is a sectional elevation of the wheel looking in the direction ofthe arrow-2 in Fig. 1.

Figs. 3, 4 and are enlarged sections, taken along the lines 3-3, 4-4,and 5-5, respectively, in Fig. 1, looking in the direction of thearrows, and showing miscellaneous details of the wheel structure.

Fig. 6 is a section taken along the line 6-6 in Fig. 5, looking in thedirection of the arrows, and showing the relation of the triggermechanism to the remainder of the device.

Fig. 7 is an enlarged View looking in the direction of the arrow 1 inFig. 5.

Fig. 8 is an enlarged,'fragmentary view of the structure illustrated inFig. 5, showing the relation of the trigger and latch devices.

Referring to the drawings, the numeral I0 designates a vehicle wheelhaving the usual inflatable tire I l which is mounted in the customarymanner on a rim l2 of a wheel l3 which is here shown as being of thedisk variety having the usual circumferentially spaced openings Madjacent the juncture of the disk portion of the wheel with the rim.

My improved emergency wheel comprises a parti-circular member l5 whichforms the major portion of the emergency wheel and is provided with apair of spaced, parallel guideways [6, each of which includes a grooveI! for receiving a guide rib l8 formed on an arm 19 that is provided ateach end of a curved segment 20. The distance between the guideways lSis slightly greater than the length of the flat portion of a deflatedtire.

as clearly indicated in Fig. l, and the curvature of the segment 20 issuch that when moved downwardly from the position illustrated in Fig. 1,it will complete the circularity of the member l5 and thus form thecomplete emergency wheel. The diameter of this wheel, and hence of themember l5, may be the same as the diameter of the inflated tire H, butis preferably slightly greater so that the tire II will not scrape alongthe ground-when the emergency wheel is carrying its portion of thevehicle load. Each arm I9 is provided with an aperture 2! which receivesa pin 22 that is slidably mounted in each guideway l6 and is normallypressed toward the arm I9 by one end of a spring arm 23 whose oppositeend is secured to the guideway I6. Accordingly, when the segment 2|! ismoved downwardly as hereinafter described, the pins 22 are forced intothe apertures 2| and hold the segment in wheel com pleting position.

A guide post 24 is secured to or formed integrally with the segment 20,preferably at the mid-portion thereof, and extends upwardly through alug 25 carried by a bearing ring 26 that is concentrically related tothe member [-5 and

